feat: add RenderDocCapture to Debug module for frame capture debugging

- Add RenderDocCapture class for dynamic loading of renderdoc.dll
- Support BeginCapture/EndCapture/TriggerCapture APIs
- Add RenderDoc log category
- Add unit tests for RenderDocCapture in tests/debug

tests/debug/test_renderdoc_capture.cpp

@@ -0,0 +1,51 @@
+#include <gtest/gtest.h>
+#include "XCEngine/Debug/RenderDocCapture.h"
+
+using namespace XCEngine::Debug;
+
+TEST(RenderDocCaptureTest, Initialize) {
+    auto* rc = &RenderDocCapture::Get();
+    bool result = rc->Initialize(nullptr, nullptr);
+    EXPECT_TRUE(result) << "RenderDoc initialization failed - check if renderdoc.dll is available";
+    EXPECT_TRUE(rc->IsLoaded());
+}
+
+TEST(RenderDocCaptureTest, Shutdown) {
+    auto* rc = &RenderDocCapture::Get();
+    rc->Initialize(nullptr, nullptr);
+    ASSERT_TRUE(rc->IsLoaded()) << "RenderDoc not loaded";
+    rc->Shutdown();
+}
+
+TEST(RenderDocCaptureTest, BeginEndCapture) {
+    auto* rc = &RenderDocCapture::Get();
+    rc->Initialize(nullptr, nullptr);
+    ASSERT_TRUE(rc->IsLoaded()) << "RenderDoc not loaded";
+
+    rc->BeginCapture("UnitTestCapture");
+    rc->EndCapture();
+}
+
+TEST(RenderDocCaptureTest, TriggerCapture) {
+    auto* rc = &RenderDocCapture::Get();
+    rc->Initialize(nullptr, nullptr);
+    ASSERT_TRUE(rc->IsLoaded()) << "RenderDoc not loaded";
+
+    rc->TriggerCapture();
+}
+
+TEST(RenderDocCaptureTest, SetCaptureFilePath) {
+    auto* rc = &RenderDocCapture::Get();
+    rc->Initialize(nullptr, nullptr);
+    ASSERT_TRUE(rc->IsLoaded()) << "RenderDoc not loaded";
+
+    rc->SetCaptureFilePath(".\\test_captures");
+}
+
+TEST(RenderDocCaptureTest, SetCaptureComments) {
+    auto* rc = &RenderDocCapture::Get();
+    rc->Initialize(nullptr, nullptr);
+    ASSERT_TRUE(rc->IsLoaded()) << "RenderDoc not loaded";
+
+    rc->SetCaptureComments("Unit test capture");
+}